Eraser-tip for lead-pencils, &amp;c.



C. W. BOMAN.

BRASBR TIP FOR LEAD PBNGILS, 6m.

APPLICATION I'ILBD DEU. 4. 1911.

Patented May 21, 1912.

si, ,i

-UNITED STATES 4PATENT OFFICE.

CLAES W. BOMAN, OF NEW YORK, N. Y., ASSIGNOR TO EAGLE PENCIL COMPANY, OF NEW YORK, N. Y.

ERASER-TIP FOR LEAD-PENCILS, &o.

Specification of Letters Patent.

Patented May 21 1912.

Application filed December 4, 1911. Serial No. 663,889.

To all whom. it may concern:

Be itknown that I, CLAES W. BoMAN, a citizen ot' the United States, residing in the city of New York, in the county and State of New York, have invented a new and use ful Improvement in lraser-Tips for Leadlencils, Pencil-Point Protectors, Metallic Pencil-Cases, and the Like, of which the following a specitlcation.

The invention relates to metallic tips designed to hold erasive material and to be used in connection with lead pencils, metallic pencil cases, pencil point protectors and other articles with which an eraser tip may be conveniently associated, and it consists in a certain construction cfr-the tip which will first be described ln connection with thc accompanying drawings and will then be more particularly pointed out in the claim.

In the drawing- Figure 1 isa view of the eraser tip together with a portion ot a lcad pencil with which the same is in this instance associated-thc parts heilig illustrated in the position they occupy when the rubber tip is projected. Fig. 2 is a longitudinal axial section of the same in the plane of the longitudinal slots in the barrel, with the parts in the position they occupy when the rubber tip is retracted. Fig. 3 is a cross-sec'- tion on line 3-3 of Fig. Q, the pronged ring being in elevation. Fig. 4 represents, detached from one another, the three metallic parts-barreh sleeve and pronged ring-ot which the tip is composed.

T lie/parts of which the tip is composed, are the barrel A, the sleeve B and the internally pronged ring C-these being the metal parts; and the block or tip proper D of erasive material. The barrel A and the sleeve B are made of sheet metal, seamless and in tubular form of cylindrical cross-scction. The rubber tip D fits, and is contained in, the barrel, and is longitudinally movable therein. The pronged ring C is also made of sheet metal; it snugly encircles the barrel A, and is longitudinally movable thereon, and the opposed inwardly projecting prongs c with which it is provided extend through slots a formed in diametrically opposite sides of the barrel, and entcr'and are embedded in the body of the eraser tip D, so that the ring and tip must move together.

Mounted upon, and movable lengthwise of, the barrel A is the sleeve B. The sleeve is rotatable upon the barrel, and has a short tongue or thread to engage a screw thread (I on the. barrel, whereby rotary movement o't the sleeve will cause it to move lengthwise of the barrel in one direction or the other according to the direction of rotation. The thread l is of such low pitch that the sleeve will bel held lirm against. endwise pressure under usual conditions ol' use. The ring C is contained in an annular internal groove c, at the rear end of the sleeve B, the ring, and consequently the rubber tip l). being compelled to partake of the lengthwise'movement only of the sleeve.

ln assembling the parts, the sleeve B is fitted upon thc barrel A, the groove c and also the tongue not heilig 'torn'ied until after the sleeve has been placed upon the barrel, the sleeve at this time being without thc tongue I, and with its rear end in the shape ot an annular flaring cup, as shown in Fig. Ll. ln this condition it is slipped onto the barrel2 after which the tongue l) may be indented into it to engage the thread d in thc barrel as seen in Fig. 2. Next the rubber tip l!) is inserted into the barrel; and then the pronged ring C is fitted upon the barrel, its prongs being bent outward as indicatcd by dotted lines in Fig. l, to permit of this being done. lter the ring tilted upon the barrel. its nongs b v means of proper tools are bent inwardly through the slots a to penetrate and embed themselves in the erasive block l), which is thus permanently united to the. ring and compelled to move therewith. The sleeve B and the ring are then moved toward each other until the ring is contained within thc annular cup at the end of the sleeve, and then the annular edge of this cup is by proper tools or machinery drawn over the ring and in around the barrel to complete the groove e-tl1c ring fitting the groove snugly but not so tightly as to interfere with the .free rotary movement of the parts relatively to one another.

IThe use of the pronged ring in this connection is of advantage in several material respects. The ring is readily and easily applied to the barrel and engaged with the rubber tip. lt furnishes a sure and steady guide and support for the tip, preyenting the latter from any lateral tilting, which might `cramp its to-and-'fro movements, and it takes a continuous annular bearing against the sleeve, which assures and steadies the tip, and evenly distributes the pressure which comes upon the latter when in use.

Having described my improvement and the best. way now known to me of carrying the same into effect, I state in conclusion that I do not limit myself strictly to the structural details hereinbefore set forth, since manifestly the same can be varied in sonic particulars without departure from the spirit of my invention; but

lVhat I claim as new and desire to secure by Letters Patent is as follows:

An eraser tip comprising a barrel longitudinally slotted on dian'letrically opposite sides, a block of erasive material contained, and movable, in. said barrel, a pronged ring encircling and movable lengthwise of the barrel and provided with prongs which inwardly project through the slots in the barrel and engage from opposite sides the erasive block, and a sleeve mounted and rotatable upon, gagement with, the barrel, and provided with an annular groove in which the pronged ring takes its bearing and is received and held so as 'to partake of the longitudinal movement only of the sleeve, substantially as and for the purposes hereinbefore set Jforth.

In testimony whereof I ailiX my signature in presence of two Witnesses.

CLAES W. BOMAN.

i Yitnessesz Y SAMUEL KRAUS,

I". T. GUGENLIN.

and having a screw thread enl 

